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【答案】
【1】 Should you not cut down too much trees? What shouldn’t do
【2】 Can you reuse plastic to make a box? What can reuse to do
【3】 What is useful? How is water?
【4】 Can you use a lot of energy? What can you use? We can’t use a lot of energy.
【5】 When did a young man cut down a big tree? Who cut down a big tree last week? How many big trees did a young man cut down last week? What did a young man do?
【解析】
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